About FASTT

16 - Water/Sewer Treatment

Epoxy Sealing

Sewer effluent from the base to the local POTW contains metals that may be above allowable limits. FASTT recommends pinpointing the source of the metals and pretreating this specific wastestream prior to it converging with the total base effluent. One of the perceived sources is CHT piping on ships. An epoxy coating could be applied to the inside of the CHT piping to prevent corrosion and extend the life of the piping. Additionally, hydro-blasting of the system would not be required, resulting in an estimated labor savings of 480 man-hours per year. Metal discharged to the sewer system would be greatly reduced.

Filter System for Recycling Water

Facility currently uses a mild steel heated freshwater dip tank for cleaning and salt removal of pipes and associated equipment. FASTT recommends installing a submersible filtration system to filter the water for reuse. Recycling water will promote water conservation.

Filter Systems/BMP

Collecting steam cleaning water and synthetic oil from the turbine is problematic. If this activity is continued, an area to capture the water is recommended. Sand bags and heavy plastic tarp could be fashioned into a catch basin to reduce run-off. An oil/water separator may be used to filter the effluent water. After analysis, the water may be suitable for disposal via the sanitary sewer.

Support Equipment shop washrack is drained to an oil/water separator which contains both a weir and a skimmer. The oil/water is uncovered and will become flooded with storm water. The oily waste will then be dispersed through the storm water. The oil/water separator should have a water tight cover installed. May be a basewide issue.

High Pressure H2O Recycle

Auto Hobby shop steam cleans engines. Waste oil and grease flow through an oil/water separator, oil is captured in a tank which is pumped out by a contractor. A high pressure water recycle system would reduce water use and leave less possibility of HW with excess oily water.

Oil/Water Separator

Shops currently have no properly designed area for washing vehicles and engine cleaning/washing. Installation of an oil/water separator should be incorporated to ensure proper control of wash/rinse waste water. Estimated savings from washing vehicles on-site, instead of off-base, is $74,000, with pay-back achieved in two years.

Outboard motors tested in either a 1500 gallon tank or a smaller 200-500 gallon tank. Operation contaminates water with oil, gasoline and dirt. FASTT Team will attempt to arrange for a portable oil and water separator with particulate filters to be prototyped in tanks. This would reduce the wastestream.

Pressure Filter System

Sewer effluent from the base to the local POTW contains metals that may be above allowable limits. FASTT recommends pinpointing the source of the metals and pretreating this specific wastestream prior to it converging with the total base effluent. If the metals come from oily waste and CHT of ships, a pressure filter system which uses diatomaceous earth to remove the metals, could be used to pretreat hydro-blast water for sewer discharge. Research suggests that this is the most efficient and cost effective type of system for onsite pretreatment.

Tank Integrity/Liners

Tank 301 at IWTF receives sea water from dry-dock operations. The 100,000 gallon tank is constructed of 3/8" carbon steel. The high sodium content of water causes serious corrosion and has raised questions about the tank's integrity. Before a complete tank replacement is undertaken, the FASTT Team recommends that NDT be performed to determine the tank's integrity. There may be a marine coating/paint or a liner system that can be used to prolong the life of the tank.

Wastewater Treatment & Water Conservation/BMP

Domestic sewage is treated in an Aerated Lagoon treatment plant. Upon review of several treatment options for the algae bloom problem in the finishing pond, there appears to be no alternative for the use of algaecide. Due to plants design, the algae blooms will occur and should be treated to reduce the concentration of TSS. The sludge within the aeration pond has become a problem. The addition of enzymes should initiate additional digestion of the sludge. FASTT recommends a vendor be contacted to perform a bench scale test.

Wastewater from aircraft washracks is treated by IWTP prior to discharge to the sewer system. Direct discharge of the wastewater to the sewer system would reduce IWTP operating costs to treat this water (approximately 4.5 million gallons annually) by $123,000 each year. Wastewater could be treated at the washrack location. Total suspended matter could be filtered out with a simple filtration system and oil and grease could be treated with off-the-shelf equipment. Labor savings for not treating the washrack water at the IWTP would be $123,000 annually, according to an economic analysis conducted at the site.

Water quench tank at welding school is emptied into sewer. Samples have shown high metal content necessitating treatment as HW. A filtered recirculation pump could be used to keep the water fresh (reusable) for a longer period of time. This action could reduce disposal of quench tank water from 100 gallons per week to 100 gallons per month.

Water Treatment

Original FASTT recommended procurement of a fuel removal system that would allow water to be sent from a barge to the local sanitary sewer. FASTT was concerned that water volume would exceed the local sewer system capacity. This is no longer the case. Based on the new FASTT review, disposal costs for the current system and proposed system are the same, manpower savings are minimal and project pay back is 70 years. This is not cost effective. Closed. No further action required.